Multiple security and oversight failures by the military, civilian government agencies and outside contractors contributed to last September's shooting rampage at the Washington Navy Yard, three reports released Tuesday found.

After entering the Navy Yard and then gaining access to a classified section, Aaron Alexis killed 12 people Sept. 16, 2013, in a 23-minute shooting spree before he was slain.

Alexis, a former sailor working as a computer expert at the Navy Yard, had a pattern of misconduct during his military service and increasingly bizarre behavior afterward that should have prevented his access to the military base, the Navy concluded.

"This information was not reported to the government as required," the Navy found. "Had this information been reported, properly adjudicated and acted upon, Alexis' authorization to access secure facilities and information would have been revoked."

An independent review of the deadly assault, in which 12 people and shooter Aaron Alexis died, criticized the escalating number of security clearances, saying they've tripled since the Sept. 11, 2001, terror attacks.

The outsider reviewers recommended that the number of military and civilian employees with such clearances -- 2.5 million within the Pentagon alone -- be reduced, with tighter controls and more frequent updates after they're granted.

Military commanders should also take steps to de-stigmatize mental-health problems and assure their troops that they won't be punished for seeking help, the outside review found.

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